Well, other than the fact that the title says it all. I loved this episode. The whole crew worked on a single very complicated (from an engineering stand point) myth. Those are my favorite, especially when they turn out like today's did. Wow!
I won't give the ending away, but it is a rather science filled episode. If you like to watch things go boom this isn't the episode for you. However, it is a masterwork of working together, and physics, and engineering. The younger set also gets to do some pretty cool extreme sports stuff (for instance that is a HUGE bungee).
I can't wait for next week's episode.